drawing methods of graphics class in java

1. Overview of the Date classClass date represents a specific moment, accurate to milliseconds2. Construction method Public Date (): Creates a day object based on the current default millisecond value Public Date (long date): Creates a Date object based on the given millisecond value3. Member Methods Public Long getTime () Public void settime (long time)4. code example:1 Packagecn.itcast_01;2 3 Importjava.util.Date;4 5 /*6 * Date: Indicates a spec

(i) Inheritance in Java:　　 About inheritance, in Java class inheritance can only be single inheritance, not as flexible as c+++, can inherit more, the consequence of multiple inheritance is a variety of relationship chaos, equivalent to a child has 2 mother, social relations complex, not conducive to the development and maintenance of the late stages of the progr

The object class is called the God class, also known as the Ancestor class. When you define a Java class, if you do not specify a parent class, the object class is inherited by default.

Java learning notes-basic methods of the File class, java learning notes-file Gradually develop the habit of writing blogs -----" Some time ago, I/O stream in the java of Mars was not fully understood, and it was difficult to find the I/O Stream. Today, I read other teaching

Original website: http://blog.csdn.net/shendl/article/details/1427475(Note: Use the following method to get the path, if there is a space character in the path, then there will be "%20" to replace, so you can then replace "%20 " with a space)Here are some ways to get the absolute path of classpath and the current class. You may need to use some of these methods to get the absolute path of the resources you

Java class member methods (member functions), java Functions Defines a Person class and adds the following member functions to improve the Person class. 1. speak member function: outputs "I am a good guy" 2. jisuan member fun

is suspended and there is a lock on the monitor that secures the critical system resources, no thread can access the resource until the target thread restarts. If the thread that is restarting the target thread wants to lock the monitor before calling resume, a deadlock occurs. This type of deadlock usually proves itself to be a "frozen" process. For more information, see why disapprove of using Thread.stop, Thread.Suspend, and Thread.Resume?.String toString ()Returns the string representation

Can not replace the original code, if there is an interface is better, no interface is best to add an interface! This is the time to understand the benefits of the interface amount!Use Annotations to upgradePackage Com.crm.net.constant;public class Comm {/** Switch User Center implementation needs to cut the annotation bean **///public static final String switch_imple = ""; Null defaults to old system public static final string switch_imple = "Neti

This post long summary, continuous improvement, direct end, the specific completion time is uncertain!First, Get seriesGetannotation (Annotationclass) Gets the comment of the classGetannotations () gets all the comments for the classGetcanonicalname () get the standard nameGetclasses () gets all of the parent class, this class, subclasses, and interfacesgetClassLoader () Get the file location of this classG

); intINDEX4 =collections.lastindexofsublist (List2, sublist); System.out.println (INDEX4); //replaces the specified element in the collection, or returns False if the element exists that returns true BooleanFlag = Collections.replaceall (List2, "Sunday", "TTTTTT"); SYSTEM.OUT.PRINTLN (flag); System.out.println (LIST2); //reverses the order of elements in the collectionCollections.reverse (LIST2); System.out.println (LIST2); //swap the position of the s

1 Privateuser copyfieldvalues (user userData, user user) {2field[] Fields =User.getclass (). Getdeclaredfields ();3string[] FieldNames =getfieldnames (fields);4 for(inti = 0; i ) {5Object value =Getfieldvaluebyname (fieldnames[i], user);6 if(Value! =NULL) {7 Setfieldvaluebyname (Fieldnames[i], UserData, Value,fields[i].gettype ());8 }9 }Ten returnUserData; One}1 Private string[] Getfieldnames (field[] fields) {2 New String[fields.l

Each time you write a graphical program, only manually adjust the JFrame frame size to display the contents. Using validate () does not work, and pack () can solve this problem.Pack ()//is automatically adapted to size. When writing a program, if preferred size is defined, the frame size is drawn according to the preferred size, or the component within the container is sized to fit.Vailate ()//is resized, provided the size has been set (SetSize () has been called) and the size has changed. such

1.equals () In the beginner Java, many people will say that when comparing objects, = = is the comparison of the address, equals () is the content of the comparison object, who said? Look at the definition of the Equals () method in the object class: public　boolean　equals(Object　obj){ 　　　　 return　(this　==　obj); } Is this a comparative content? is obviously the comparison pointer (address) Mody ... But

automatically invoked. If the parent class does not have a constructor with no parameters, and the constructor of the parent class is not explicitly called in the constructor of the subclass, the Java compiler will report an error (except for the absence of any explicit constructors in the parent class), which is also

PHP calls two java methods. The Java Language is powerful, so it is very useful to call Java functions in php in many cases. There are two methods to call the Java language in php: one is to use the

Summary: This article displays the running output of a well-constructed class structure and the actually generated Java bytecode (bytecode) using the javap tool) shows Java programmers how a class is constructed and generated at runtime. Keywords: Java construct javap bytec

C # Call the java class and jar package methods 1. Package the compiled Class file in java; Package the command JAR For example, you can package all the class folders in a directory; Command Used: jar cvf test. jar-C com /. He

Recently learned to inherit, from the book to see the subclass inherit the parent class, the subclass has all the parent class properties and methods, and then use the program to verify that the parent class's private properties and private methods, the subclass is inaccessible, of course, some of the parent's private

Hot girl remarks: Today I received a letter from cqq (the guy who cracked the Tianyi background system using java). Unfortunately, he compiled a class file. I have no idea about programming. I searched to see how to compile it into an exe file. So I found this article. In fact, the following dude is more amazing. Several Methods for locally compiling

) need to note:1. Overriding overrides is required for the return type, while the overloaded overload does not require a return type.Overloading can change the return type. Because the compiler can statically compile different methods by identifying the signature of the method. This is also one of the differences between overloading and rewriting in Java.2. Strictly speaking, overrides are polymorphic becau